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<title>class XMP - irb: Ruby Standard Library Documentation</title>


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    <main role="main" aria-labelledby="class-XMP">
    <h1 id="class-XMP" class="class">
      class XMP
    </h1>

    <section class="description">
    
<p>An example printer for irb.</p>

<p>It’s much like the standard library PrettyPrint, that shows the value of each expression as it runs.</p>

<p>In order to use this library, you must first require it:</p>

<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">&#39;irb/xmp&#39;</span>
</pre>

<p>Now, you can take advantage of the <a href="Object.html#method-i-xmp"><code>Object#xmp</code></a> convenience method.</p>

<pre class="ruby"><span class="ruby-identifier">xmp</span> <span class="ruby-identifier">&lt;&lt;END</span>
<span class="ruby-value">  foo = &quot;bar&quot;
  baz = 42
</span><span class="ruby-identifier">END</span>
<span class="ruby-comment">#=&gt; foo = &quot;bar&quot;</span>
  <span class="ruby-comment">#==&gt;&quot;bar&quot;</span>
<span class="ruby-comment">#=&gt; baz = 42</span>
  <span class="ruby-comment">#==&gt;42</span>
</pre>

<p>You can also create an <a href="XMP.html"><code>XMP</code></a> object, with an optional binding to print expressions in the given binding:</p>

<pre class="ruby"><span class="ruby-identifier">ctx</span> = <span class="ruby-identifier">binding</span>
<span class="ruby-identifier">x</span> = <span class="ruby-constant">XMP</span>.<span class="ruby-identifier">new</span> <span class="ruby-identifier">ctx</span>
<span class="ruby-identifier">x</span>.<span class="ruby-identifier">puts</span>
<span class="ruby-comment">#=&gt; today = &quot;a good day&quot;</span>
  <span class="ruby-comment">#==&gt;&quot;a good day&quot;</span>
<span class="ruby-identifier">ctx</span>.<span class="ruby-identifier">eval</span> <span class="ruby-string">&#39;today # is what?&#39;</span>
<span class="ruby-comment">#=&gt; &quot;a good day&quot;</span>
</pre>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(bind = nil)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a new <a href="XMP.html"><code>XMP</code></a> object.</p>

<p>The top-level binding or, optional <code>bind</code> parameter will be used when creating the workspace. See WorkSpace.new for more information.</p>

<p>This uses the <code>:XMP</code> prompt mode, see <a href="IRB.html#module-IRB-label-Customizing+the+IRB+Prompt">Customizing the IRB Prompt at <code>IRB</code></a> for full detail.</p>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File irb/xmp.rb, line 49</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">bind</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-constant">IRB</span>.<span class="ruby-identifier">init_config</span>(<span class="ruby-keyword">nil</span>)

  <span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:PROMPT_MODE</span>] = <span class="ruby-value">:XMP</span>

  <span class="ruby-identifier">bind</span> = <span class="ruby-constant">IRB</span><span class="ruby-operator">::</span><span class="ruby-constant">Frame</span>.<span class="ruby-identifier">top</span>(<span class="ruby-value">1</span>) <span class="ruby-keyword">unless</span> <span class="ruby-identifier">bind</span>
  <span class="ruby-identifier">ws</span> = <span class="ruby-constant">IRB</span><span class="ruby-operator">::</span><span class="ruby-constant">WorkSpace</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">bind</span>)
  <span class="ruby-ivar">@io</span> = <span class="ruby-constant">StringInputMethod</span>.<span class="ruby-identifier">new</span>
  <span class="ruby-ivar">@irb</span> = <span class="ruby-constant">IRB</span><span class="ruby-operator">::</span><span class="ruby-constant">Irb</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">ws</span>, <span class="ruby-ivar">@io</span>)
  <span class="ruby-ivar">@irb</span>.<span class="ruby-identifier">context</span>.<span class="ruby-identifier">ignore_sigint</span> = <span class="ruby-keyword">false</span>

  <span class="ruby-constant">IRB</span>.<span class="ruby-identifier">conf</span>[<span class="ruby-value">:MAIN_CONTEXT</span>] = <span class="ruby-ivar">@irb</span>.<span class="ruby-identifier">context</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
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                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-puts" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">puts</span><span
                                class="method-args">(exps)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Evaluates the given <code>exps</code>, for example:</p>

<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">&#39;irb/xmp&#39;</span>
<span class="ruby-identifier">x</span> = <span class="ruby-constant">XMP</span>.<span class="ruby-identifier">new</span>

<span class="ruby-identifier">x</span>.<span class="ruby-identifier">puts</span> <span class="ruby-string">&#39;{:a =&gt; 1, :b =&gt; 2, :c =&gt; 3}&#39;</span>
<span class="ruby-comment">#=&gt; {:a =&gt; 1, :b =&gt; 2, :c =&gt; 3}</span>
  <span class="ruby-comment"># ==&gt;{:a=&gt;1, :b=&gt;2, :c=&gt;3}</span>
<span class="ruby-identifier">x</span>.<span class="ruby-identifier">puts</span> <span class="ruby-string">&#39;foo = &quot;bar&quot;&#39;</span>
<span class="ruby-comment"># =&gt; foo = &quot;bar&quot;</span>
  <span class="ruby-comment"># ==&gt;&quot;bar&quot;</span>
</pre>

                              <div class="method-source-code" id="puts-source">
            <pre><span class="ruby-comment"># File irb/xmp.rb, line 74</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">puts</span>(<span class="ruby-identifier">exps</span>)
  <span class="ruby-ivar">@io</span>.<span class="ruby-identifier">puts</span> <span class="ruby-identifier">exps</span>

  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@irb</span>.<span class="ruby-identifier">context</span>.<span class="ruby-identifier">ignore_sigint</span>
    <span class="ruby-keyword">begin</span>
      <span class="ruby-identifier">trap_proc_b</span> = <span class="ruby-identifier">trap</span>(<span class="ruby-string">&quot;SIGINT&quot;</span>){<span class="ruby-ivar">@irb</span>.<span class="ruby-identifier">signal_handle</span>}
      <span class="ruby-identifier">catch</span>(<span class="ruby-value">:IRB_EXIT</span>) <span class="ruby-keyword">do</span>
        <span class="ruby-ivar">@irb</span>.<span class="ruby-identifier">eval_input</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">ensure</span>
      <span class="ruby-identifier">trap</span>(<span class="ruby-string">&quot;SIGINT&quot;</span>, <span class="ruby-identifier">trap_proc_b</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">catch</span>(<span class="ruby-value">:IRB_EXIT</span>) <span class="ruby-keyword">do</span>
      <span class="ruby-ivar">@irb</span>.<span class="ruby-identifier">eval_input</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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